Typewriting-machine



1 Patenwafxug. 23,1921.

3 SHEETS-SHEET 1.

A. W. SMITH.

TYPEWRITING MACHINE.

APPLlcATloN rlLEn1uNE25.19\9.

non BSU? mv .W

G3 nella;

INVENTR Patented Aug. 23, 1921.

3 SHEETS-'SHEE H15 ATTURNEY .Lm Nl -mu HCE www www .Nm WMM Aww nu ww m DI A 5 2 m 1 E 8 E m A, w. SMITH.

T YPEWRITING MACHINE. APPLICATION FILED .IUNE25, 1919.

Patented Aug. 23, 1921.

3 SHEETS-SHEET 3- I INvI-:NTDFI WI'TNEEEES MM l HIE ATTUFINEY UNITED STATES PATENT OFFICE.

.ARTHUR W. SMITH, 0F NEW YORK, N. Y., ASSIGNOR TO REMINGTON TYPE- WRITER COMPANY, 0F ILION, NEW YORK, A CORPORATION 0F NEW YORK.

TYPEWRITING-MACHINE.

Application filed .Tune 25,

To all 107mm t may con cem Be it known that I, ARTHUR W. SMITH, citizen of the United States, and resident of the borough of Manhattan, city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Typewriting-Machines, of which the following is a specification.

My invention relates to typewriting and like machines and more particularly to socalled margin control or safety mechanism by which the carriage may always be accurately started from the point determined by the margin stops in beginning a new line of writing.

(lo-acting margin stops are designed to arrest the carriage always at the salme letter space position when it is drawn back to begin a new line vof writing, such position being determined by the adjustment of one of said stops. However' under certain conditions and modes of operation of the machine the. carriage will not come to rest at the intended letter space position but will drop or advance one step, so that the particular line where this occurs will be indented to the extent of one letter-space.

One of the main objects of my invention, generally stated, is to provide a simple, yet highly efficient and reliable mechanism to overcome these difficulties.

More specifically stated, one of the main objects of the invention is to provide mechanism of the character specified which remains out of cooperation with the escapement mechanism at all times in both the backward and forward travel of the carriage, except at the beginning of a line wherealone it is intended to function.

A further object of the invention is to provide a construction such as that specified which is positively acted on to bring it into operation only at the last part of the return movement of the carriage to begin a new line of writing.

A still further object of the invention is to .Y control the movementV of the locking member into operative or locking position, by the margin stops.

To the above and other ends which will hereinafter appear my invention consists in `fthe features of construction, arrangements Specification of Letters llatent. Patented Aug 1919. serial No. 306,684.

of parts and combinations of devices set forth in the following description and particularly pointed out in the appended claims. In the accompanying drawings wherein like reference characters indicate corresponding parts in the various views,

Figure l is a fragmentary vertical fore and' aft sectional view of the upper portion of one form of typewriting machine em bodying my invention.

Fig. 2 is a detail fragmentary perspective view of the margin control mechanism and some of the associated parts, as they appear when the carriage has been drawn back to begin a new line of writing and the locking member has been thrown into operative or locking position.

Fig. 3 is a detail fragmentary plan view of the same.

Fig. 4 is a detail plan view of the margin stops andsome of the associated parts, as they appear when the carriage is arrested in its return movement.

Fig. 5 is a view similar to Fig. 4 of a modified form of construction.

In the present instance I have shown my invention embodied in a machine in which the carriage construction, line lock mechanism, and margin stop mechanism in the main are like the corresponding parts in the Nos. 10 and ll Remington machines, and in which the type action, the escapement mechanism and means for controlling the escapement from the type action and space key are likethe corresponding parts disclosed in the application of Oscar Woodward, Serial No. 278,657, filed February 24, 1919; some details of the escapement being like corresponding parts disclosed in the application of'Oscar Woodward, Serial No. 252,377, filed September 3, 1918.

Thile the devices of my invention are capable of being readily incorporated in a machine of the character specified above with- (not Shown), corner posts 1 and a top plate 2. The usual Remington carriage, designated as a whole by the reference numeral 3, is mounted on fixed guide rails l and 5 to travel over the top plate from side to side of the machine. The carriage carries a platen 6 and the usual releasable feed rack 7 which meshes with a feed pinion 8. This pinion is operatively connected to the escapement device or wheel 9 by the usual backing pawl and ratchet so that the escapement wheel and feed pinion turn together during the step-by-step letter-space movement of the carriage in the direction of its feed, or from right to left in the present instance, and the feed pinion turns in the opposite direction independently of the escapement wheel when the carriage is moved back in the opposite direction to begin a new line of writing. The escapement wheel` in its step-by-step letterv feed movements is under control of suitable escapement devices which inthe present instance comprise a movable dog 10 and a fixed dog 11 which latter is shown as a sheet metal dog having an in-V clined Working face, the dog being adjustably secured by screws 12 to a dog rocker or carrier 13 pivoted at 14, as disclosed in the Woodward application, Sr. No. 278,657 hereinbefore referred to. When the parts are in the normal position, or at rest, a tooth a of the escapement Wheel in the so-called zero or 6 oclock position ordinarily engages.

the loose dog 10 and by the superior power of the carriage spring overcomes the power of spring 15 of the loose dog and holds it against a stop 16 on the dog rocker. A stop 17 limits the movement of the loose dog in the opposite direction when'it is freed from a tooth of the escapement wheel and is returned under the action of its spring 15. then the escapemcnt wheel is in the position shown in Fig. 2 the tooth thereof following the tootha in the zero position,Y

has its rear side engaged by the free end of a light spring detent 18 secured on the upper side of the top plate by screws 19, and reinforced throughout a part of its length by a non-resilient or stiffer metal strip 20 that likewise is secured in place byv the screws 19. It will be seen that this detent enables the escapemcnt wheel to turn forward, or in the direction of its feed, but prevents a backward rotation of the wheel from its normal position or from a position in which a tooth thereof is in the zero position indicated at a.

Motion may be transmitted to the dog rocker by any suitable means. In the present instance each type action includes a type bar 21 pivoted at 22 to a type bar segment, and adapted to be moved upwardly and rearwardly by a key actuated member 23 --and to strike against the front face of the platen 6. A universal bar 24 is mounted for movement fore and aft of the machine, being moved rearwardly by the heel of a type bar coacting therewith. Two rear-r wardly extending arms 25 on the universal bar are connected with upright arms near the ends of a rockv shaft 26. A'centrally disposed arm 27 on this shaft carries a pin 28 at its upper end, said pin being received in a slot 29 in the forward end of a link 30. The rear end of this link is forked at 31 where it straddles a headed pin 32 projecting laterally from an arm 33, adjustably secured to and depending from the dog rocker 13. A depression of a printing key is effective to move the universal bar rearwardly, and through the intermediate connections move the upper end of the dog rocker forwardly, thus releasing the loose dog 10 from the wheel and bringing the inclined face of the fixed dog into engagement with the same tooth (a) of the wheel which was just released by the loose dog. When the loose dog isr thus released from the wheel it is moved back under the action of its spring 15 until arrested by the stop 17. It

is then in a position to coact with the next succeeding tooth of the escapement wheel when pressure on the depressed key isl released, and the dog rocker and the parts which control it are returned to their normal positions by their respective returning springs, not shown. As the parts are herein shown,rit is during the return movement of the parts described that the let-off or feed of the carriage takes place thus providing an ordinary feed. However, the construction is such that an ordinary feed, reverse feed, or any extent of drop between the two may be provided by reason-of the adjustment of the dog 11, etc., as explained in the hereinbefore mentioned Woodward application- Serial No. 278,657. It is immaterial, so far as my present invention is concerned what the character of the feed is since the device of my invention will act to attain its purpose whatever the nature of the feed employed. f

Motion is transmitted to the dog rocker from the space key by an arm 311 which carries a pin 35 received in the forked end of a lever' 36. This lever is pivoted at 37 to a depending bracket 38 secured to the top plate, and the upper end of the lever coacts with a lug 39 on the link 30, and through said link transmits motion to the dog rocker. A spring 40 is effective to return the lever 36 and the parts connected therewith to normal position.

In carrying out my invention T employ, in the present instance, margin stop mechanism to control the movement of the socalled margin locking or safety member, device, or dog, into operative or locking position. The margin stop mechanism herein shown is the same as that used in the Nos.

10 and 11 Remington machines excepty for slight changes which'will hereinafter'appear.

In the Remington machine a stop 41 is mounted on a casting 42 secured by screws 43 to the forward fixed carriage rail 4. A pivotal support 44 for the stop 4l enables it to receive a pivotal movement to clear it from contact with the line lock and margin stops on the carriage, and also to receive a bodily movement from its normal position with the carriage in the movement of the latter from right to left, in order to operate the line lock mechanism when an end of a line is reached. The normal position of the stop 41 in the ordinary Remington machines correspond substantially to that indicated in Fig. 5 and in dotted lines in Fig. 4, where it rests against the right-hand wall of a slot 45 in the casting 42, and movement of the stop to the right from this position is prevented by said right-hand wall. In the present instance I have cut away the righthand wall of the slot 45 to a depth of about 110- of an inch which in effect locates the right-hand wall 46 of the slot about 11D- of an inch farther to the right than it ordi-v narily is. The normal position of the stop 41 in the present instance is that indicated by dotted lines in Fig. 4, and is about midway between the right-hand end wall 46 and the left-hand wall 47 of the slot 45. The stop is normally maintained in this centered position by means which will hereinafter appear, and is adapted to be shifted to the left from such position in the usual manner to actuate the line lock mechanism, and is adapted to be shifted to the right to actuate the margin dog as will presently appear. Thus, it will be seen that the usual depending portion 41a on the stop 41 coacts with a part 48 of a member 49, pivoted at 50 to a. slide 51 which controls the line lock mechanism inthe usual manner when moved to the left by the stop L1-41a. This slide is mounted on the bottom of the forward fixed rail 4 by headed screws 52, the stems of said screws extending through slots 53 in the slide to afford a limited sliding movement of the lat-ter. A contractile spring 54 is connected at one end 55 to the member 49, and is effective to normally maintain the member 49, and the slide 51 to which it is connected, at the limit of their movement to the right, as shown in Figs. 2 and 3, the partsbeing arrested in this position by the left-hand end walls of the slots 53 coacting with the screws 52. By reason of the fact that the part 41a of the stop 41 coacts with the member 49, the spring 54 tends to move the stop 41 to the right a distance corresponding to the movement of the slide 51. The opposite end of the spring 54 is connected at 56 to a second slide, actuating, or controlling member A57, the spring tending to pull said slide to the left. This slide is also mounted on and beneath the forward fixed carriage rail 4 by headed screws 58, the stems of which pass through slots 59 in the slide and afford a limited movement of the latter from its normal position to the right, to the position represented in Figs. 2 and 3. The force of the spring54 normally holds the slide 57 to the limit of its movement to the left, where it is arrested by the right-hand end walls of the slots 59 coacting with the screws 58, whereas the spring normally holds the slide 51 to the limit of it movement to the right. The slide 57 has a linger or contact portion 60 which coacts ywith the depending portion 41 of the stop 41. Therefore, the force of the spring 54 is exerted in opposite directions, through the slides 51 and 57, to normally hold the stop 41 midway between the end walls of the slot 45, as shown in dotted lines in Fig. 4, and to return it to said position from the right or left when the stop is relieved from the superior force exerted thereon by the coacting margin or line lock stops.

The slide 57 carries a dependingpin 61 which extends below the top plate through the large central opening 2a therein. -A bent sheet metal lever 62 extends fore and aft of the machine beneath the top plate from the front to the rear of the machine, and is fulcrumed on the top plate by a headed pivot screw 63. The stem of a hea ded screwstop 64'passes through a transverse slot 65 in the lever to limit the movement of the latter on its fulcrum. The forward end of the lever normally extends into the path of the pin 61 in the movement of the latter from left to right with the slide 57. The rear end portion of the lever carries a light wire spring 66, the Vforward end of which passes through a hole 67 in the lever. The rear end portion of the spring is bent at right angles to the body portion, to form a link-like portion 68 which yextends to the left and passes freely through a barrel or cylindrical guide portion G9 formed at the rear end of the lever. The body portion of the spring, where the bendis formed therein, normally bears against the right-hand end of the cylindrical portion 69 of the lever, being held against it by the tension of the spring. Intermediate this point and the point where the spring is anchored to the lever at 67, the springis flexed and held exed by a lug 70 struck up from the lever and against which the spring bears. The left-hand end of the link-lilrerportion 68 of the spring is pivotally connectednt 71 to a pivoted locking member or dog, designated as a whole by the reference numeral 72. This locking or safety member, in the present instance, is shown mounted on and beneath the top plate by a headed pivot screw 73 which, as shown, is in the same plane as the escapement wheel and at about the same level as the lowermest tooth a of the wheel. The holding dog is formed with a hook-like engaging portion 74 projecting from one side of the body portion of the dog and adapted to enter between the teeth of the wheel, as shown in Figs. 2 and 3, and to engage the forward face of the lowermost tooth t when said tooth is in the sor-called G oclock7 or Zero position. At this time the rear side of the next succeeding tooth of the wheel is engaged by the detent 18, so the Iwheel is locked against forward and backward movement. It will be understood that pressure exerted by the engaged tooth of the escapement wheel on the locking dog 72 is exerted longitudinally of the dog and directly in line with and against the pivot 7 3 thereof, thus effectively blocking a feed movement of the wheel.

In order that the locking dog may be held against accidental displacement from either its locking or releasing position I prefer to employ frictional means for holding the dog indefinitely in either of the said positions to which it may be moved. A simple form of frictional means shown in the draw-V ings comprises an integral part or frictional member bent from and folded over and substantially parallel with the body portion of the dog, and preferably out of contact therewith. This part is apertured in line withl the screw receiving aperture in the body portion of the dog in order. that the stem of the screw 73 may pass through the apertures in both parts and be threaded into a tapped opening in the topplate. The head of the screw 7 3 bears against the friction member 75 and confines the dog between the head of the screw and the top plate with suflicient frictional resistance to hold the dog in the position to which it may be turned on the pivot screw 73.

The usual line lock and margin stops carried by the carriage of the Nos. 10 and 11 Remington machines are employed to coact with the stop 41 to attain the usual results, the margin stops, however, attaining the additional result of controlling the locking dog 72 to positively move it into operative or locking position shown in Figs. l, 2 and 3.

Thus the adjustable carriage-carried margin stop 76 of usual construction coacts with the stop 41 when the carriage is returned to the right to begin a new line of writing. Just beforethe arrest of the carriage the stop 7G coacting` with the stop 41 will cause the latter to move with it, and with the carriage, until the stop 4i coacts with the righthand wall 46 .of the slot 45, as shown in full lines in Fig. 4. This results in the arrest of the carriagein proper position to begin a new line of writing, as determined by the setting of the adjustable margin stop 76. In the meantime, however, the movement of the stop 41 to the right with the carriage has resulted in movingV the slide 57 to the right, thereby shifting the lever 62 and turning the locking dog into its locking position, where it engages a tooth a of the escapement wheel in the zero position and prevents letter feed movement of the escapement wheel, and a letter space drop of the carriage. It willbe understood that in the act of returning the carriage to the right described above the feed pinion 8 is turned back by the rack independently of the escapement wheel. This tends to turn the escapement wheel and its shaft back with the pinion, but this is resisted by the detent 18 which holds the wheel where the tooth a thereof is in the 6 oclock or Zero position, ready to be engaged bythe margin locking dog 72 without allowing the wheel to be displaced from such position before the dog 72 is brought into locking position.

The locking dog having thus been positively moved into locking position by the travel of the carriage back to begin a new line of writing, will be held indefinitely in such position by its frictional retaining means until the dog is positively moved from such locking position. For this purpose I prefer to employ an adjustable contact or screw 77 which is threaded through a tapped opening in the dog rocker 13, and is adapt-ed to coact at its inner end with a depending finger or contact 78 on the locking dog. When the dog 72 is in the locking position shown in Figs. 2 and 3, the in- 100 ner end of the screw 77 is close to or in contact with the member 78 on the locking dog, so that the first actuation of the dog rocker, effected either by a printing key or by the space key, is effective to simultaneously move the locking dog out of engagement with the escapement wheel, thus permitting a letter-space drop of the carriage.

Then the lever 62 is actuated to vmove the locking dog into operative position, the spring 66 is not flexed; the parts operating positively at this time to move the locking dog into position. The main purpose of the spring is to enable the locking dog to be moved forward out of locking position by an operation of the dog rocker, even when the carriage is at the end of its travel to the right and holds the slide 57' and the lever (32 against return movement. Were it notv for the spring', the release of the locking dog 120 might be blocked at this time. The parts may have a slightly different action depend ing on the character of the feed. If, for example, an ordinary feed is employed, such as is provided for under the adjustment of the parts shown, and the lever 62 be held in its actuated position by the mar-V gin stops, then an actuation of the dog' rocker resultsin moving the locking dog forward to releasing position against the tension of the spring 66, while the lever 62 and slide 57 are held against movement. At this time only that portion of the spring indicated in dotted lines in Fig. 3 is flexed as shown, and will tend to return the dog to the locking position as long as the lever 62 is thus held against return movement. However, as soon as slide 57 and the lever 62 are released from control of the carriage by one or more forward letterspace movements of the latter. the slide 57 will be returned to normal position by the spring 54, and at this time a movement of the locking dog to releasing position by the dog rocker causes a movement of the lever 62 back to position` where it may be again actuated by the slide 57 when the carriage is returned to begin a new line of writing. At this time the spring will not be flexed. Vhen the locking dog and the lever' are both moved back to normal position, as last described, they will be held indelinitely in such position by the friction means until again actuated by the coperation of the margin stops. It' on the other hand a reverse teedpis employed, and a letter space 'drop .of the carriage takes place on the down stroke of the key, then the carriage will be ted forward one space and release the lever 62 by the same stroke of the key that is effective to return the locking dog and Jthe lever 62 to normal position. Tn any event the first one or two strokes of a rkey at the beginning of a` line effects a return of the locking dogand leverr 62 to normal position where they are held indefinitely by the friction means, it being observed that the latter is entirely independent or the means by which the locking dog is moved into and out ot locking position.

lVhile l prefer to employ the adjustable contact 77 on the dog rocker to coact with the contact 78 on the locking dog` both of these parts may be dispensed with if desired without alllecting the acti-on ol the dog rocker in automatically releasing the locking dog. Thus, from an inspection of VFig. 3 it will be seen that when the locking dog is in the locking position the end oi the engaging portion 74 thereof stands in liront of and in Contact with the fixed dog 1l. Therefore, a torwardmovement of the latter is etlective to move the locking` dog to releasing1 position in the absence of the coperating contacts 7 7 and 78. Y Y

lt has been found in practice that one of the greatest factors in giving an inadvertent letter space drop to the carriage when it is returned to begin a new line oiE writing, is that in the rapid'operation of a machine an operator will sometimes depress a key, or complete the depression of a key already started, after the carriage has been arrested by the line lock stops, and before the line lock mechanism can block the printing operation. This results in freeing the loose dog and allowing it to be drawn back under the power of its spring 15 for coperation with the next advancing tooth of the escapement wheel. However, when the depressed lrey is released the carriage will not advance as it ordinarily does, since the carriage and consequently the escapement wheel as well, are held against advance movement by the line lock stops. It follows that when the carriage is returned to begin a new line of writing it will not be brought to rest at the point determined ordinarily by the margin stops, but will b e brought to rest one letter space to the left thereof, because the loose dog is not holding the wheel, but is located against the stop 17 in a position to coact with the next tooth in advance of the Zero tooth of the wheel. As a result of this the carriage advances one space with the coaeting tooth of the wheel as soon as the carriage spring is tree to advance the carriage. By my present invention the margin holding or locking dog is automatically thrown into operation only at the time required, z'. e., just before the carriage is arrested in its return movement, and it therefore prevents the inadvertent letter space drop of the carriage pointed out above, even though the loose dog does not engage the zero7 or 6 oclock tooth a of the wheel, which ordinarily would result in such a letter space drop ofthe carriage.

By reason of the fact that the locking dog is positively moved into `operative position, and does not rely on spring acting or frictional means to thus move it, the construction is reliable in operation and el'ective in use. Moreover, the disengagement of the locking dog, or a movement thereof to releasing position, is at all times automatically and positively effected by means entirely independent of those which control the movement of the dog into operative position, thus giving the greatest assurance ot reliability of action of the locking dog in its releasing movement and also in its locking movement. The locking dog remains out of action and control, and out of coperative relation with the escapement wheel at all times during the letter feed travel of the carriage and during its return movement, except at and about the time the carriage is arrested by the margin stops, when the locking dog is intended to function. This results in releasing the'carriage and keys of any load incident to a constant control of the locking dog, and prevents any chance of the loeking'dog intert'ering with the usual and orderly operation of the escapement mechanism throughout the line of writing, except at the beginning of the line when the locking dog is intended to be effective to prevent an unintended letter space drop of the carriage. These are regarded as important features of the present invention and result in an imf proved margin control mechanism which is highly eflicient and reliable in use, and is not liable to interfere with the usual operation of the machine except to perform its intended function in the manner described at the time intended, and at no other time.

In order to avoid any complication in setting the margin and line lock stops relatively to the carriage scale, due to the displacement to the right of the stop 41 when the carriage is returned, the stop 41 may be provided on its left-hand face With a contact plug 79 off-set to the left, say, lof an inch, as shown in Fig. 5. This compensates for the movement of the stop 4l to the right -11-5 of an inch, and therefore no change in the scale is necessary to provide a proper setting for both margin and line lock stops according to the indices on the scale.

IVhile I have described in detail one form of mechanismy embodying my invention I am aware that Various changes may be made Without departing from the scope of the invention as defined in the accompanying claims.

What I claim as new and desire to secure by Letters Patent, is

l. In a typewriting machine, the combination of a carriage, escapement mechanism therefor, a locking member coperative with a part of said escapement mechanism to lock it against operation, means operative to movethe locking member into locking position only during the stoppage of the return movement of the carriage, and independent means for moving the locking member to releasing position, said locking member being adapted to be restored to unlocking position during the first printing operation at the beginning of a new line of Writing.

2. In a typevvriting machine, the combination of an escapement wheel, a locking member therefor, means positively controlled by the movement of the carriage for moving the locking member into locking position, a type action, means controlled by an operation of the type action for moving the lock to the releasing position, and independent means for holding said locking member in either of the said positions to which it may be moved by said moving means.

3. In a typevvriting machine, the combination of a carriage, escapement mechanism therefor including a dog carrier, a locking member coperative with a part of the escapement mechanism other than the dog carrier so that the latter is free to be actuated When the locking member is effective, co-acting margin stops for limiting the return movement of the carriage, means controlled by one of said margin stops for moving said locking member into locking position, and means for releasingsaid locking member by an actuation of the dog carrier.

4. In a typewriting machine and in margin control mechanism, the combination of a carriage, escapement mechanism therefor, a

locking member coacting with a part of said escapement mechanism to lock it against operation and which is ineffective during the step-by-step letter feed movement of the c carriage after the first one or tWo movements thereof at the beginning of a line, and automatically operating means controlled by the return movement of the carriage to begin a new line of Writing and operative only just before the arrest of the carriage in such movement to move said locking member into locking position.

5. In a typewriting machine and margin control mechanism, the combination of a carriage, escapement mechanism therefor, a locking member coacting With a part of said escapement mechanism to lock it against operation, frictional means for retaining the locking member indefinitely in the operative and inoperative positions to Which it may be moved, automatically operating means Wholly independent of said frictional means for moving said locking member to the operative or locking position by a return movement of the carriage, and automatically operating means wholly independent of said frictional means for moving said locking member to the inoperative or releasing position.

6. In a typewriting machine, the combination of a carriage, escapement mechanism therefor, and margin control mechanism including a locking member ycooperative With a part of the escapement mechanism to locl: it against operation, coacting margin stops for limiting the return movement of the carriage, and means controlled by'one of said margin stops for moving the locking member into locking position by thereturn movement of the carriage.

7. In a typevvriting machine and margin control mechanism, the combination of escapement mechanism, a locking member operative only at or near the beginning of a line of Writing to lock a part of the escapement mechanism against operation, positively operating means controlled by the return movement of the carriage and acting only near the end of its return movement for moving said locking member into locking position, and independently automatically operating means for releasing said locking member at the first operation of a printing key or the space key.

8. In a typevvriting machine and margin control mechanism, the combination of a carriage, escapement `mechanism therefor, a locking member cooperative with a part of said escapement mechanism to lock it against operation, a lever which controls the movement of the locking member into locking position, and a member on the carriage which positively engages and actuates said lever only at the last part of the return movement of the carriage and by said return movement.

9. In a typewriting machine, the combination of a carriage, escapement mechanism therefor, and margin control mechanism including a locking member cooperative with a part of said escapement mechanism to lock it against operation, frictional means intermediate the frame of the machine and said locking member for holding the latter to the frame in either the locking or releasing position to which it may be moved, means independent of said frictional means for moving the locking member into locking position by a return movement of the carriage, and independent means for releasing said locking member.

l0. In a typewriting machine, the combination of a carriage, escapement mechanism therefor including a dog carrier, and margin control means including a locking member adapted to coact with and lock a part of the escapement mechanism, positively actuated means controlled by a movenient of the carriage in one direction to move said locking member into locking position, and means controlled by the dog carrier for releasing said locking member.

ll. In a typeivriting machine and margin control mechanism, the combination of a,

carriage, escapement mechanism therefor, a locking member coacting with a part of said escapement mechanism to lock it against operation, and means controlled by the return movement of the carriage for moving said locking member to operative or locking position, said means comprising a positively acting Contact on the carriage and a coperative movable contact on the frame of the machine and vvitli which the carriage contact coacts to positively move it only at the last part of the return movement of the carriage to begin a new line of Writing, whereby the locking member is only moved to locking Iposition just before the arrest of the carriage in its return movement.

12. In a typewriting machine, the combination of a carriage, escapement mechanism therefor, and margin control mechanism including a locking member cooperative with y a part of the escapement mechanism to lock it against operation, coat-ting margin stops for limiting the return movement of the carriage, means controlled by one of said margin stops for moving' the locking member into locking position by the return movement of the carriage, and independently operable automatically actuated means for releasing said locking member.

13. In a typevvriting machine, thel combination of a carriage, escapement mechanism therefor including an escapement Wheel and `a dog carrier, and margin control means comprising a locking member adapted to lock the escapement Wheel against letter space movement, positively actuated means controlled by the movement of the carriage back to begin a new line of Writing for controlling the movement of the locking member into locking position, and means controlled by a movement of the dog carrier for moving said locking member to the releasing position and freeing the escapement Wheel.

14. In a typeivriting machine and margin control mechanism, the combination of a carriage, escapement mechanism therefor including an escapement Wheel, a locking member cooperative with said escapement Wheel. to lock it against operation, a lever which controls the movement of the locking member into locking position, a member on the carriage which positively engages and actuates said lever only at the last part of the return movement of the carriage, and automaticallyl operating positively actuated means for moving said locking member to releasing position. Y

l5. In a typewriting machine', the combination of a carriage, escapement mechanism therefor including an escapement Wheel, and margin control mechanism including a locking member cooperative With said escapement Wheel to lock it against operation, frictional means intermediate the' frame of the machine and said locking member for holding the latter to the frame in either the locking or releasing position to which it may be moved, positively opera-ted means independent of said friction means for moving the locking member into locking position by a return movement of the carriage, and independent positively operated means for releasing said locking member.

1G. In a typewriting machine, the combination of a carriage, escapement mechanism therefor including an escapement Wheel and dog carrier, and margin control mechanism including a locking member coperative with the escapement wheel to lock it against operation, coacting margin stops for limiting the return movement of the carriage, and means controlled by one of said margin stops for moving said locking member into locking position when the margin stops are' brought into cooperation at the return movement of the carriage.

17. In a typew iting machine and margin control mechanism, the combination of a carriage, escapan ent mechanism thereforv including an escapement Wheel and dog car-v rier, a locking member coacting with said escapement Wheel to lock it against operation, frictional means for retaining' the lool*- ing member indefinitely in the operative and inoperative positions to which it may be moved, automatically operating means Wholly independent of said frictional means for moving said locking member to the operative or locking position by a return movement of the carriage, and means for enabling a movement of the dog carrier to move said locking member to inoperative or releasing position.

1S. In a typeivriting machine and in margin control mechanism, the combination of a carriage, escapement mechanism therefor, a locking member coacting` with a part of said escapement mechanism to lock it against operation and Which is ineffective during the step-by-step letter feed movement of the carriage after the first one or tivo movements thereof at the beginning of a line, automatically operating means controlled by the return movement of 'the carriage to begin new line of Writing and operative only just before the arrest of the carriage in such movement to move said locking member into locking position, and automatically and independently operating means for releasing said locking means.

19. In a typewriting machine, the combination of a carriage, escapement mechanism herefor including an escapement Wheel, and margin control mechanism including a locking` member cooperative with the escape-- ment wheel to lock it against operation, coasting margin ctops for limiting the return movement of the carriage, means controlled by one of said margin stops for moving said locking member into locking posit-ion when vthe margin stops are brought into copera-I tion at the return movement ofthe carriage, and independently operable automatically actuated means for moving said locking member to the releasing position.

In a typeivriting machine, the com,- bination of a carriage, escapement mechanism therefor including an escapeinent Wheel and dog carrier, a locking mem- -ber cooperative With said yescapement Wheel to lock it against operation, a controlling member which controls be movement of the lockingv member into locking position, a springv intermediate said controlling member and said locking member and through Which motion is transmitted. from one to the other, a member on the carriage Which posi-- tively engages and actuates said controlling member only at the last part of the return movement of the carriage, and means controlled by the movement of said dog carrier for moving said locking member to releasing position.

2l. In a ypeivriting machine, the combination of a carriage, escapement mechalnism therefor including an escapement wheel and a dog carrier, and margin control mechanism including a locking member cooperative with said escapement Wheel to loci; it against oreration, frictional means intermediate the frame of the machine and said locking member for holding the latter to the frame in either the locking or releasing position to which it may be moved, positively operated means independent of said frictional means for moving the locking member into locking position by a return movement of the carriage, and means Whereby the movement of the dog carrier is operative to release said locking member.

22. In a typewriting machine, the combination lof a carriage, escapement mechanism therefor, a type action, and margin control means for preventing an unintentional drop of the carriage, said means'comprising a safety dog cooperative With the escapement mechanism to lock a part thereof, means positively controlled by the return movement of the carriage for moving said dog into locking position, and means controlled by an actuation of the type action for controlling the movement of the safety dog out of locking position.

25. In a typewriting machine, the combination of a carriage, escapement mechanism therefor including an escapement Wheel and dog carrier, and margin control mechanism including a locking memberv coperative With the escapement Wheel to lock it against operation, coacting margin stops for limiting the return movement of the carriage, means controlled by one of said margin stops for moving said locking member into locking position when the margin stops are brought into coperation at the return movement of the carriage, and means controlled by an operation of the dog carrier for moving said locking member to the releasing position.

Q-l. In a typevvriting machine and margin control mechanism, the combination of a carriage, escapement mechanism therefor including anescapement Wheel and a dog carrier, a locking member coaeting With said escapement Wheel to lock it against opera-` tion, means controlled by the return movement of the carriage for moving said locking member to operative or locking position, said means comprising a positively acting contact on the carriage anda cooperative movable contact on the frame of the machine and with which the carriage contact coacts to positively move it only at the last part of the return movement of the carriage to begin a new line of Writing, whereby the locking member is only moved to locking position just before the arrest of the carriage in its return movement,yand means controlled by an actuation 0f said dog carrier for releasing said locking member. 4

25. In a typewriting machine, the combination of a carriage, escapement mechanism therefor including an escapement Wheel and dog carrier, a locking member cooperative With said escapement Wheel to lock it against operation, a lever which controls the movement of the locking member into locking position, a spring intermediate said lever and Asaid locking member and through which motion is transmitted from one to the other, a contact on the carriage Which positively engages and actuates said lever only at the last part of the return movement of the carriage, and means conthe carriage in its return movement, and a locking member moved by said margin stops on tliereturn of the carriage into position to l coact With andlock against operation a part of said escapement mechanism, said locking ine-niber beingadaptedv to'be restored to unlocking position during the first printing operation at the. beginning` of a newv line of Writing.

2T. In a typewriting machine, Vthe combination of'a carriage, escapement mechanism therefor including" an escapement ivheel, and margin control mechanism comp'rising ahlocling member cooperative With said escapement Wheel to lock it against o eration,...fiictional.- means intermediate the frame of the machine and said locking member forholdingzthe latter to the frame in either the locking or releasing position to which it may be moved, a controlling member for moving` said locking member into locking position, a contact on'the carriage operating positively to move said controlling member in the movement of the carriage back to begin a new line of Writing and only at a given point in such movement of the carriage, and means for moving' said locking member to releasing position.

28. In a typeivriting machine and margin control mechanism, the combination of a carriage, escapement mechanism therefor, a locking membercoperative with a part of said escapement mechanism to lock it against operation, a lever which controls the movement of the locking member into locking position, a spring intermediate said lever and locking member and through Which motion is transmitted from the lever to said locking member, and a member on the carriage which positively engages and actuates said lever only at the last part of the return movement of the carriage.

29. In a typeivriting machine and in margin control mechanism, the combination of a carriage, escapement mechanism therefor including an escapement Wheel and dog carrier, a locking member coacting with said escapement Wheel to lock it against operation and Which is ineffective during the step-bystep letter feed movement of the carriage after the first one or two movements thereof at the beginning of a line, automatically operating means controlled by the return movement of the carriage to begin a new line of Writing and operative only just before the arrest of the carriage in such movement to move said locking member into locking position, and means controlled by the operation of said dog carrier for releasing said locking member.

30. In a typewriting machine, the combination of a carriage, printing instrumentalities including depressible keys, escapement mechanism therefor, and margin control mechanism comprising margin stops foi' arresting the carriage in its return movement', a locking member moved by said margin stops at the end of the return movement of the carriage into position to coact with and lock against operation a part of said escapement mechanism, and means carried by a part of said escapement mechanism and controlled by the operation thereof for releasing said locking member at the first depression of a key for beginning anew line of Writing.

31. In a typewriting machine, the combination of a carriage, escapement mechanism therefor including an escapement Wheel and dog carrier, and margin control mechanism comprising a locking membercoperative With said escapement Wheel to lock it against operation, fric-tional means intermediate the frame of the machine and said locking member for holding the latter to the frame in either the locking or releasing position to which it may be moveda controlling lever for moving said locking member into locking position, a contact on the carriage operating positively to move said controlling lever in the movement of the carriage back to begin a new line of Writing and only at a given point in such movement of the carriage, and means whereby a movement of the dog carrier is effective for moving said locking member to releasing position.

32. In a typevvriting machine, the combination of a carriage, escapement mechanism therefor including an escapement Wheel, and margincontrol mechanism comprising margin stops brought into eoperation by a return movement of the carriage, and a locking member moved by said margin stops to coactdirectly With said escapement Wheel and lock it against operation, said locking member being automatically restored to unlocking position by a regular printing operation.

33. In a typevvriting machine, the combination of a carriage, escapement mechanism therefor including an escapement wheel and dog carrier, and margin control mechanism comprising a locking member coperative With said escapement Wheel to lock it against operation, frictional means intermeugico diate the frame of the machine and said locking member for holding the latter to the frame in either the locking or releasingposition to which it may be moved, Va controlling lever for moving said locking member into locking position, a spring interposed between said locking member and lever and through which motion is transmitted from one to the other, a contact on the carriage operating positively to move said controlling lever in the movement of the carriage back to begin a new line of writing, and means whereby a movement of the dog carrier is eifective ormoving said locking member to releasing position.

34. In a typewriting machine and in margin control mechanism, the combination of a carriage, escapement mechanism therefor, a locking member coacting with a part of said escapement mechanism to lock it against operation and which is free to remain indefinitely in either the operative or inoperative position to which it may be moved, means positively controlled wholly by the return movement of the carriage for moving said locking member into locking position, and automatically independently operated means for positively moving said locking member to releasing or inoperative position.

In a typewriting machine, the combination oi? a carriage, escapement mechanism therefor, and margin control mechanism comprising a locking member coperative with a part of said escapement mechanism to lock it against operation, positively operated controlling means for moving said locking member to locking position,

the same including a spring through which -said motion is transmitted, and independent means for moving the lock-ing member to the releasing position and against the tension of said spring if said controlling means should be blocked against return movement.

36. In a typewriting machine, the combination of a carriage, escapement mechanism therefor including an escapement Wheel and dog carrier, and margin control mechaber into locking osition, a spring interposed between said loc in member and lever and through which motion is transmitted from one to the other, a margin stop von the carriage, a cooperating margin stop movably mounted on the frame and operating said controlling lever, and means whereby a movement of the dog carrier is e'ective for moving said locking member to releasing position.

Signed at the borough of Manhattan, city of New York, in the county of New York and State of New York, this 20th day of June, A. D. 1919.

ARTHUR W. sMITH.

Witnesses:

CHARLES E. SMITI'I, E. M. WELLS. 

